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INCOME TAXES - Deferred income tax assets and liabilities (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Allowance for doubtful accounts $ 181 $ 58
Accruals and reserves 1,673 2,552
Other 644 259
Total deferred tax assets 2,498 2,869
Deferred tax liabilities:    
Property, plant, and equipment 3,579 3,610
Investments in foreign subsidiaries 0 1,215
Total deferred tax liabilities 3,579 4,825
Valuation Allowance (44) (37)
Net deferred tax asset/(liability) $ (1,125) $ (1,993)